Conservation Evidence strives to be as useful to conservationists as possible. Please take our survey to help the team improve our resource.

Providing evidence to improve practice

Individual study: Increase in abundance and diversity of insectivorous birds in remnant eucalypt woodland after cull of noisy miners Manorina melanocephala and restoration of understorey

Published source details

Debus S.J.S. (2008) The effect of noisy miners on small bush birds: an unofficial cull and its outcome. Pacific Conservation Biology, 14, 185-190


This study is summarised as evidence for the intervention(s) shown on the right. The icon shows which synopsis it is relevant to.

Reduce inter-specific competition for nest sites of songbirds by removing competitor species Bird Conservation

A before-and-after study of bird species in privately owned remnant eucalypt woodland in New South Wales, Australia (Debus 2008), found a decline in small and medium songbirds after a dense colony of noisy miners Manorina melanocephala became established.  The number of bird species increased after a cull of the noisy miners, and improved further as new planting of native trees and shrubs became established.   The results are consistent with noisy miners causing a decline in small woodland bird diversity by competitive exclusion, released by culling.  The restoration of a shrub layer is likely to have played a part in the maintained increase in the diversity of bird species, but the relative contributions of the cull and planting cannot be quantified.    The study was not replicated or controlled, and the cull was unofficial and unsanctioned.